FC Schalke 04 manager Jens Keller could be without Nigerian striker Chinedu Obasi for the rest of the campaign. <br /><br />For the past three seasons,Obasi has struggled with injuries, which has limited his appearances in the Bundesliga.<br /><br />Chinedu Obasi has been carrying a 30 centimeter long titanium nail in the left shin, which was broken at the 2010 World Cup. <br /><br />From a medical point of view, Obasi is healed but he still experiences pains.<br /><br />The previous plan was for the Super Eagle to undergo surgery in the summer . The surgery is likely to be brought forward because of the pains being experienced.<br /><br />This season, the 26 - year - old attacker played only 4 matches in the Bundesliga.<br /><br />Photo Credit: schalke04.de<br /><br /><br /><br /><br /><br /><br />